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Radius of a Basketball Rim

by
author image Eleanor McKenzie
Based in London, Eleanor McKenzie has been writing lifestyle-related books and articles since 1998. Her articles have appeared in the "Palm Beach Times" and she is the author of numerous books published by Hamlyn U.K., including "Healing Reiki" and "Pilates System." She holds a Master of Arts in informational studies from London University.
Radius of a Basketball Rim
A basketball rim in a gymnasium. Photo Credit Bee-Creative/iStock/Getty Images

The standard basketball rim used by NBA professionals, university and senior high players has an 18-inch inside diameter, giving it a radius of 9 inches. Rim measurements in international competitions are slightly different.

International Rims

The International Basketball Federation official rules specify that the rim has a minimum inside diameter of 450 millimeters and a maximum of 459 millimeters. This approximates to 17.7 to 18 inches, in which case the rim radius is about the same as the NBA standard 9-inch radius. The rules for ball circumference allow for a minimum of 29.4 inches and maximum of 30.7 inches.

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